Elyses Destructured Enchantments

const numberOfMoons = [0, 2, 14];
const [venus, mars, neptune] = numberOfMoons;

neptune;
// => 14

const weather = {
  sun: '☀️',
  sun_behind_small_cloud: '🌤️',
  sun_behind_cloud: '⛅',
  sun_behind_large_cloud: '🌥️',
  sun_behind_rain_cloud: '🌦️',
  cloud: '☁️',
  cloud_with_rain: '🌧️',
  cloud_with_snow: '🌨️',
  cloud_with_lightning: '🌩️',
  cloud_with_lightning_and_rain: '⛈️',
};

const { sun, cloud, cloud_with_lightning: thunder } = weather;

sun;
// => '☀️'

cloud;
// => '☁️'

thunder;
// => '🌩️'

Instructions

Elyse, magician-to-be, continues her training. She has a deck of cards she wants to manipulate.

To make things easier, she usually only starts with cards numbered 2 to 10, although some of the tricks may involve additional (face) cards.

Want to help Elyse level up her magic?

1. Get the first card

Elyse will summon the first card in the deck without using the array[index], .at(index), or .shift(). It's just like magic.

const deck = [5, 9, 7, 1, 8];

getFirstCard(deck);
// => 5

2. Get the second card

Elyse performs sleight of hand and summons the second card in the deck without using the array[index] or .shift().

const deck = [3, 2, 10, 6, 7];

getSecondCard(deck);
// => 2

3. Swap two cards

Elyse will make the two cards of the deck switch places. She doesn't need to call a single function.

const deck = [10, 7];

swapTwoCards(deck);
// => [7, 10]

4. Shift three cards around

In order to perform some more sleight of hand, Elyse takes three cards and quickly moves the top card to the back, making the middle card the first card and the old bottom card the middle card. She doesn't need to call a single function.

const deck = [2, 6, 10];

shiftThreeCardsAround(deck);
// => [6, 10, 2]

5. Pick the named pile

Elyse will separate the deck into two piles. She then asks the observer to pick one of the two piles, which we'll name chosen. The disregarded pile is no longer relevant, which she makes disappear. She doesn't need to call a single function.

const deck = [5, 4, 7, 10];
const chosen = [5, 4];
const disregarded = [7, 10];

pickNamedPile({ chosen, disregarded });
// => [5, 4]

5. Swap the picked pile

Unfortunately the observer keeps picking the "wrong" pile, but with some clever fast magic, Elyse renames the chosen pile to be disregarded and the disregarded pile to be the chosen pile. She doesn't need to call a single function.

const deck = [5, 4, 7, 10];
const chosen = [5, 4];
const disregarded = [7, 10];

swapNamedPile({ chosen, disregarded });
// => { chosen: [7, 10], disregarded: [5, 4] }